[PATCH v2 4/7] i2c: i2c-core-acpi: Add i2c_acpi_dev_name()

[Daniel Scally <djrscally@xxxxxxxxx>]

We want to refer to an i2c device by name before it has been
created by the kernel; add a function that constructs the name
from the acpi device instead.

Signed-off-by: Daniel Scally <djrscally@xxxxxxxxx>
---
Changes in v2:

	- Stopped using devm_kasprintf()

 drivers/i2c/i2c-core-acpi.c | 16 ++++++++++++++++
 include/linux/i2c.h         |  5 +++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 37c510d9347a..98c3ba9a2350 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -497,6 +497,22 @@ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
 }
 EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
 
+/**
+ * i2c_acpi_dev_name - Construct i2c device name for devs sourced from ACPI
+ * @adev:     ACPI device to construct the name for
+ *
+ * Constructs the name of an i2c device matching the format used by
+ * i2c_dev_set_name() to allow users to refer to an i2c device by name even
+ * before they have been instantiated.
+ *
+ * The caller is responsible for freeing the returned pointer.
+ */
+char *i2c_acpi_dev_name(struct acpi_device *adev)
+{
+	return kasprintf(GFP_KERNEL, I2C_DEV_NAME_FORMAT, acpi_dev_name(adev));
+}
+EXPORT_SYMBOL_GPL(i2c_acpi_dev_name);
+
 #ifdef CONFIG_ACPI_I2C_OPREGION
 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
 		u8 cmd, u8 *data, u8 data_len)
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 4d40a4b46810..b82aac05b17f 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -998,6 +998,7 @@ bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
 u32 i2c_acpi_find_bus_speed(struct device *dev);
 struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
 				       struct i2c_board_info *info);
+char *i2c_acpi_dev_name(struct acpi_device *adev);
 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle);
 #else
 static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
@@ -1014,6 +1015,10 @@ static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
 {
 	return ERR_PTR(-ENODEV);
 }
+static inline char *i2c_acpi_dev_name(struct acpi_device *adev)
+{
+	return NULL;
+}
 static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
 {
 	return NULL;
-- 
2.25.1